I wanted just to say you that I try the ALSA Loopback device and JACK alsa_in/alsa_out clients. It is terrific to interface alsa <-> jack. I added a few words about it into the wiki.
The original article is here: http://alsa.opensrc.org/Jack_and_Loopback_device_as_Alsa-to-Jack_bridge Ciao, Dominique -- "We have the heroes we deserve."
